<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <!-- 页面渲染 -->
                        <el-row :class="['bdbottom',i1 ===0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close='removeRightById(scope.row,item1.id)'>{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2 ===0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <!-- 渲染二级 -->
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close='removeRightById(scope.row,item2.id)'>{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 三级权限 -->
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close='removeRightById(scope.row,item3.id)'>{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    <!-- <pre>
                        {{scope.row}}
                    </pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                     <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                     <el-button size="mini"  type="danger" icon="el-icon-delete">删除</el-button>
                     <el-button size="mini"  type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
            <!-- 分配权限对话框区域 -->
        <el-dialog
            title="分配权限"
            :visible.sync="SetRightDialogVisible"
            width="50%" @close='SetRightDialogClosed'>
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key='id' default-expand-all :default-checked-keys='defKeys' ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="SetRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click='allotRights'>确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
    // 定义所有角色列表数据
      rolelist: [],
      //   控制分配权限对话框显示与隐藏
      SetRightDialogVisible: false,
      //   所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //   默认选中的节点id值数组
      defKeys: [],
      //   当前即将分配权限的角色id
      roleId: ''
    }
  },
  //   生命周期函数
  created() {
    //   获取所有角色列表数据
    this.getRolesList()
  },
  methods: {
    //   获取所有角色列表  async +await 简化异步请求
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }

      this.rolelist = res.data

      console.log(this.rolelist)
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
    // 弹框提示用户是否要删除
      const confirmResult = await
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      //   没有return 表示删除成功，刷新列表  把服务器返回的最新权限赋值给当前角色role.children属性， 防止整个列表刷新 提升体验
      //   this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限对话框 async修饰方法
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限数据 await简化
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      //   把获取到的权限数据保存到 data中
      this.rightslist = res.data
      console.log(this.rightslist)

      //   递归获取三级节点id
      this.getLeafKeys(role, this.defKeys)

      this.SetRightDialogVisible = true
    },
    // 通过递归的形式 获取角色下所有三级权限的id 并保存到数组中defKeys
    getLeafKeys(node, arr) {
    // 如果当前 node节点不包含children属性 则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      //   循环node数组 调用递归函数
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配对话框的关闭事件
    SetRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      //   成功弹框提示用户
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.SetRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
     border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>
